Can you find out the missing number in the grid?

What has a bottom at the top?

If an electric train is travelling south, then which way is the smoke going?

A family is trapped in a jungle. There is a bridge which can lead them to safety. But at one time, the bridge can only allow two people to pass through. Also, all of them are afraid of the dark and thus, they can't go alone.

Father takes 1 minute to cross, the mother takes 2 minutes, the son takes 4 and the daughter takes 5 minutes. While crossing the time taken will be according to the slower one. How can they all reach the other side in the minimum possible time?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

What has many teeth, but cannot bite?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

Rectify the following equality 101 - 102 = 1 by moving just one digit.